<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>代码风格</title>
    <style>
        h1 {
            color: red;
            font-size: 80px;
        }
    </style>
</head>
<body>
    <h1>欢迎来到上海学习</h1>
</body>
</html>